This is a Panzerjäger Marder III ausf M, a typical german adaptation of an anti-tank gun on an obsolete Czech built 38(t) chassis. This particular version was the last of its series, the version M (for Mid mounted engine). Its 75mm Pak 40 gun was a feared weapon and could deal with pretty much anything the American or British could field at the time it was issued to the Panzertruppe in early 1944. The model is from japanese manufacturer Tamiya and it unfortunately has tracks that are a little too long. Nobody's perfect but I love that little bugger!